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In Reply to: Experts recommend a light behind the TV during viewing... posted by Paul in Sterling on December 30, 2001 at 14:01:12:
This is true only when using an RPTV or a Direct View CRT.It is a terrible idea for FPTV ;-)
Regards,
Follow Ups:
Why is placing a lamp behind a FP reflective area (not the projector itself) a bad idea?If you place a lamp behind your screen you will bias your visual system to perceive dark greys to be black. By adjusting this lighting you can gain higher perceived black values than without.
Or did I misunderstand you?
Cheers,
HalcyonPS IMHO the above only applies if one calibrates the video chain properly and has an accurate enough dimmer/scale attached to the backlight for proper adjustments.
Halcyon,Assuming we're properly calibrated, I can think of a few reasons:
0) Any light source in the room would still get back onto the screen without all surfaces being completely absorbent. So now you've got some washed out coloration.
1) CRT projectors have no issues with black levels, so a bias light does nothing more than to decrease the apparent brightness level of a source that's already low output. So you get a decreased contrast ratio available by introducing ambient light.
2) Digital projectors generally have higher light outputs, and can utilize a gray screen to improve perceived black levels, without using a bias light. Once again reflections are the enemy, and you don't want any light getting reflected back into the screen.
Regards,
.
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